Auto lock- Win2003

Recently i have installed win-2003 at my office which comprises of 300 pcs. This network was running on Win-NT till date . Now i am transferring it to Win-2003 by departments . I already put3 departments under win-2003 and also kept 90 days and 3 time failure password policy.

Recently i have noticed that all the pc gets locked automatically every morning even the right password been entered and i have to manually unlock it and then only user can log in .

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